Detailed Weather Data for Project: HUDS

Date Time TAIR WSPD RELH SRAD 06Dec2017 8 a.m. 33.06 0.80 62.65 12.50 06Dec2017 9 a.m. 34.92 0.30 69.40 146.20 06Dec2017 10 a.m. 40.32 0.40 52.28 292.70 06Dec2017 11 a.m. 44.10 0.60 42.59 237.30 06Dec2017 12 p.m. 45.68 1.00 46.25 19.30 06Dec2017 1 p.m. 48.49 2.40 43.68 17.60 06Dec2017 2 p.m. 51.28 5.40 37.28 9.80 06Dec2017 3 p.m. 52.20 6.80 35.74 6.80 06Dec2017 4 p.m. 52.77 8.60 35.04 2.00 06Dec2017 5 p.m. 52.59 7.20 34.26 0.90 06Dec2017 6 p.m. 50.02 6.10 39.51 0.00 06Dec2017 7 p.m. 32.20 3.40 46.04 0.00 06Dec2017 8 p.m. 45.59 3.30 48.38 0.00 06Dec2017 9 p.m. 42.78 0.70 67.07 0.00 06Dec2017 10 p.m. 40.42 0.30 64.98 0.00 06Dec2017 11 p.m. 37.90 1.20 74.16 0.00 07Dec2017 12 a.m. 37.80 3.90 68.40 0.00 07Dec2017 1 a.m. 38.48 6.30 56.09 0.00 07Dec2017 2 a.m. 36.45 7.40 63.17 0.00 07Dec2017 3 a.m. 34.02 10.00 60.29 0.00 07Dec2017 4 a.m. 32.04 9.00 54.04 0.00 07Dec2017 5 a.m. 30.40 8.00 58.65 0.00 07Dec2017 6 a.m. 28.13 9.30 61.64 0.00 07Dec2017 7 a.m. 26.33 9.10 64.29 0.00 Accuml. Values 967.94 111.50 1285.88 745.10 Num. Valid Values 24 24 24 24 Avg. Values 40.33 4.65 53.58 31.05 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values 4.63 179.40 53.58 64.06 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.4642 definition: xcompl = 1 - (RELH_avg/100) TdC = -3.9960 definition: TdC = TAIR_avg - ((14.55 + (0.114*TAIR_avg))*xcompl +pow((2.5 + 0.007*TAIR_avg)*xcompl, 3) + (15.9 +0.117*TAIR_avg)*pow(xcompl, 14)) del_lambda1 = 0.4749 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.5251 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.4333 definition: Qn = 0.00714*SRAD_avg + 0.00000526*SRAD_avg*pow(TAIR_avg+17.8, 1.87) +0.00000394*pow(SRAD_avg, 2) - 0.00000000239*pow(SRAD_avg, 2)*pow(TAIR_avg-7.2, 2) - 1.02 es_ea = 3.9708 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 3.1642 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.057 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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